This is a short video of 9K2GS operating W3JK remotely as W2/9K2GS. (This is legal as 9K has reciprocal arrangement with USA, please see http://www.arrl.org/FandES/field/regu... )The transceiver used is a Yaesu-FT2000, the amplifier is a Yaesu Quadra and the antenna is a Optibeam OB17-4. The remote station was controlled using PCC-2000 software and Skype was used for Audio.
Tuesday, 12 October 2010
Monday, 11 October 2010
2m D-Star simplex calling channel on IC-2200H
2m D-Star calling channel (144.6125MHz) on Sunday 10/10/10 from Gillingham in Kent.
Not much happening, even though there's a bit of a lift on 2m.
Not much happening, even though there's a bit of a lift on 2m.
Saturday, 9 October 2010
Comet CHA250 Broadband Vertical
Following my discovery that eHam have pulled my review of the CHA250 (done a couple of years ago and was on the site for a long while) I thought I would make a graphic demonstration of how this antenna compares with an alternative 'restricted space' antenna, the Cobwebb. This video seeks only to present the truth, as seen by the front end of a receiver; the one with the most accurate S-meter available in the amateur radio world...
The Cobwebb is mounted 2 metres higher than the mean height of the CHA250, which in terms of HF is not significant. The CHA250's feeder has 0.3dB less loss than the Cobwebb @ 21 MHz.
The test receiver is a Flex-5000 SDR which has a calibrated S-meter, not AGC derived and is highly accurate, making it the ideal choice for this test. Combined with the identical second receiver, true A/B comparisons are easily accomplished in real time.
A/B tests don't exist for the CHA250 in its previous mounting location however I firmly believe that it performed considerably better at 2.5m AGL than it does at 7m (feedpoint).
The Cobwebb is mounted 2 metres higher than the mean height of the CHA250, which in terms of HF is not significant. The CHA250's feeder has 0.3dB less loss than the Cobwebb @ 21 MHz.
The test receiver is a Flex-5000 SDR which has a calibrated S-meter, not AGC derived and is highly accurate, making it the ideal choice for this test. Combined with the identical second receiver, true A/B comparisons are easily accomplished in real time.
A/B tests don't exist for the CHA250 in its previous mounting location however I firmly believe that it performed considerably better at 2.5m AGL than it does at 7m (feedpoint).
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